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[Timmer]

   Hi everybody. Has anybody got any useful tips on making my own battery packs?

[andyn]

Easy enough to do with Nimh's so long as you buy cells with solder tags. This way you can use an ordinary soldering iron to connect them together.

I chopped a 1700mah nicd apart that came in my heng long tank and made a 1.2v 10200mah pack for powering my glowstart for IC engines.

[PMK]

For those NiMHs and NiCDs without the solder tags, you can buy a double-headed bit that attaches to the soldering iron, designed to apply heat to the terminals of two cells at once. The idea is to apply heat to the negative of the first cell and also to the positive of the second cell, then quickly push both cells together while the solder is still molten.
The only other tip I'd recommend - especially in the case of NiMH cells - is to use a hefty-wattage iron and not to linger with the heat on the terminals for any longer than necessary.

[Timmer]

Ah.......easy then ill let you know how i get on

[DickyD]

They let you take your computer into the General then 

[malcolmfrary]

When soldering non-tagged cells, breaking the plating with emery helps, as does using flux to help with tinning.  I had to re-learn this sort of thing after many years of using pre-tinned wire.  Using a BIG iron is vital to ensure that the time spent heating the cell is minimised.